#!/usr/bin/python
# -*- coding:utf-8 -*-
# @FileName : python_test9_8.py
# Author    : myh

# 练习 9.9：电池升级　在本节最后一个 electric_car.py 版本中，给
# Battery 类添加一个名为 upgrade_battery() 的方法。这个方法
# 检查电池容量，如果电池容量不是 65，就设置为 65。创建一辆电池容
# 量为默认值的电动汽车，调用方法 get_range()，然后对电池进行升
# 级，并再次调用 get_range()。你将看到这辆汽车的续航里程增加
# 了。

class Car:
    """一次模拟汽车的简单尝试"""

    def __init__(self, make, model, year):
        """初始化描述汽车的属性"""
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0
        self.battery = Battery()

    def get_descriptive_name(self):
        """返回格式规范的描述性名称"""
        long_name = f"{self.year} {self.make} {self.model}"
        return long_name.title()

    def read_odometer(self):
        """打印一个句子，指出汽车的行驶里程"""
        print(f"This car has {self.odometer_reading} miles on it.")

    def update_odometer(self, mileage):
        """将里程表读数设置为给定的值"""
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't roll back an odometer!")

        def increment_odometer(self, miles):
            """让里程表读数增加给定的量"""
            self.odometer_reading += miles


class Battery:
    """一次模拟电动汽车电池的简单尝试"""
    def __init__(self, battery_size=40):
        """初始化电池的属性"""
        self.battery_size = battery_size

    def describe_battery(self):
        """打印一条描述电池容量的消息"""
        print(f"This car has a {self.battery_size}-kWh battery.")

    def upgrade_battery(self):
        if self.battery_size != 65:
            self.battery_size = 65


    def get_range(self):
        """打印一条消息，指出电池的续航里程"""
        if self.battery_size == 40:
            range = 150
        elif self.battery_size == 65:
            range = 225
        print(f"This car can go about {range} miles on a full charge.")


class ElectricCar(Car):
    """电动汽车的独特之处"""
    def __init__(self, make, model, year):
        """初始化父类的属性"""
        super().__init__(make, model, year)


car1 = Car('A', 'B', 'C')
car1.battery.get_range()

car1.battery.upgrade_battery()

car1.battery.get_range()
